We exhibit programs that illustrate the power of Lisp as a language for expressing the design and organization of computational systems. The examples are chosen to highlight the importance of abstraction in program design and to draw attention to the use of procedures to express abstractions. This article exhibits programs that illustrate the power of Lisp as a language for expressing the design and organization of computational systems. The examples are chosen to highlight the importance of abstraction in program design and to draw attention to the use of procedures to express abstractions. Any programming language provides primitive components, means by which these can be combined, and means by which patterns of combination can be named and manipulated as if they were primitive. With appropriate abstractions to separate the specification of components from the details of their implementation we can provide a library of standard components that can be freely interconnected, allowing great flexibility in design.

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